The QuietAir range is designed to provide powerful extraction levels that exceed the requirements of the latest Building Regulations. Fans ideally should be quiet when they operate but not at the cost of performance. This fan will perform to Building Regulations Installed Performance requirements, on BOTH speeds for bathrooms, utility and kitchens. Therefore when you take into consideration the noise level and energy consumption of this fan in relation to its performance then the QuietAir is class leading. This fan has also been designed to deal with a longer duct run when compared to other axial designed fans. To achieve the longest duct run, rigid ducting should be used and not flexible ducting.